Off to your next microadventure! The heart of your bikepacking gear, the ORTLIEB Seat-Pack, is easily mounted to the seatpost with extra-strong Velcro straps. A practical bonus: the saddlebag also serves as a mudguard off-road. The spacious, waterproof Seat-Pack reliably keeps your clothes dry. The bag's volume can be cleverly adjusted between 8 and 16.5 liters or between 4.5 and 11 liters by tightening the roll-top closure on the sides, depending on the length of your trip. An additional valve allows for quick and easy compression and even greater compactness. For a day trip, the Seat-Pack is ideal as a backpack alternative, whether you're riding a cross bike, mountain bike, road bike, or e-mountain bike. The bag is available in two sizes. A mounting height of six centimeters on the seatpost is sufficient for the smaller of the two bags, therefore the more compact version is ideal for smaller frame sizes, full-suspension bikes and bikes with a dropper seatpost. Specifications 11 Litre: Height: 26 cmWidth: 40 cmDepth: 15 cmVolume: 11 lWeight: 345 gWaterproof: Yes (IP64)Material: PU-coated nylon (PS21R, PS33) Specifications 16.5 Litre: Height: 30 cmWidth: 64 cmDepth: 22 cmVolume: 16.5 lWeight: 456 gWaterproof: Yes (IP64)Material: PU-coated nylon (PS21R, PS33) PRODUCT: F9912, F9902